ADBG - Maximum Security Duct / Barrier Grille

Contractor shall furnish and install heavy duty duct barrier grille, type ADBG as herein specified, where shown on plans. The unit shall be as manufactured by Anemostat Products. The duct barrier grille shall be all steel welded construction. The vertical bars shall be 3/4" diameter steel welded to the sleeve on 6" maximum centers. When duct height exceeds 12" the horizontal bars shall be 2 1/2 x 3/8 flat steel bar welded to the sleeve. The sleeve shall be 10 GA welded steel. Two 1" x 1" x 3/16 steel angle locking frames shall be supplied, one continuous welds to the sleeve by the manufacturer, and one shipped loose for contractor to field weld to the sleeve. The ADBG unit shall be finished with factory white powder coat finish. Note: round sleeve shall be 12 GA.